When I add a power supply (battery or DC), it starts the power up process, showing the splash screen, but it never gets any further than that.

I must then disconnect the power supply to turn off the camera.

Then, interestingly enough, if I turn the switch to the off setting, attach a power supply, and turn it to media, it powers up and I can access the thumbnails of the media clips--even watch them. Then I can turn it off.

Next, after turning it off, if I turn it on (for the camera), it starts the power up and hangs on the splash screen. Then when I attempt to turn it off, nothing happens and I have to disconnect it once again.